Search found 150 matches

by Steam Captain
Sun Nov 21, 2021 9:37 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 134
Views: 148910

Re: digital steam engine indicator

The story behind the 100 bar on the screen: It was originally all in psi and inches and I took the screen photos when I was halfway through into converting everything into metric units. So, the pressure units were still in psi, but the unit name already in bar. And in fact, the program is written in...
by Steam Captain
Wed Nov 10, 2021 3:12 pm
Forum: Technical - Engines and Boilers
Topic: What water speed do you work with in monotube boilers?
Replies: 15
Views: 10841

Re: What water speed do you work with in monotube boilers?

Thanks. That's very interesting to see.
I guess frothing flow relates to dispersed bubble flow.
by Steam Captain
Tue Nov 09, 2021 11:28 pm
Forum: Technical - non Engines and Boilers
Topic: Best rpm for plunger pumps?
Replies: 21
Views: 17393

Re: Best rpm for plunger pumps?

I renew Cyberbadger's question 50% for his and 50% for my own curiosity.
by Steam Captain
Tue Nov 09, 2021 11:22 pm
Forum: Technical - non Engines and Boilers
Topic: Engine ready
Replies: 26
Views: 14653

Re: Engine ready

I tried burning drift wood a couple of times and learned my lesson not to pick it up. I rather make fire with damp wood if I need to, but never driftwood. But "my" driftwood is usually filled with salt or brine and even when bone dry barely burns. I suspect you're talking about sweet water driftwood...
by Steam Captain
Tue Nov 09, 2021 7:02 pm
Forum: Technical - Engines and Boilers
Topic: What water speed do you work with in monotube boilers?
Replies: 15
Views: 10841

Re: What water speed do you work with in monotube boilers?

hello Fred. Excuse my occasional long pauses. I can't prevent them from happening.
I don't have anything except the name frothing flow. I hoped to be able to milk you for intelligence as usual. Which you gave. If it were a thing, at least SOME documents would address the phenomenon.
by Steam Captain
Tue Nov 09, 2021 5:45 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 134
Views: 148910

Re: digital steam engine indicator

This does look nice already. I've been tinkering with a python software to output the data from the arduino. This is an impression of what to expect: https://imgpile.com/images/UqAX3C.png The graph was created by feeding it data from the arduino. Unfortunately, I have no workshop right now, but I le...
by Steam Captain
Thu Jul 29, 2021 10:18 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 134
Views: 148910

Re: digital steam engine indicator

Yes, Fredrosse, those type of pressure transducers would do the trick. The china ones unfortunately work only if you reduce the sample rate per rotation and run the engine slowly. 100 samples per rotation for 600rpm is VERY optimistic for the china sensors. 600rpm means 10rps - with 100 samples per ...
by Steam Captain
Wed Jul 28, 2021 4:33 pm
Forum: Technical - Engines and Boilers
Topic: What water speed do you work with in monotube boilers?
Replies: 15
Views: 10841

Re: What water speed do you work with in monotube boilers?

Hello Fredrosse, Your project sounds very interesting. Concerning the diagram Cyberbadger shared with us: Is the dispersed flow the best condition the water-steam can be in inside a monotube? And to what extend would a frothing flow have an effect on steam production? Is the difference negligible? W...
by Steam Captain
Wed Jul 28, 2021 4:21 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 134
Views: 148910

Re: digital steam engine indicator

Yes, and you now see the problem I was having with the cheap pressure sensors. If you zoom in on one single stroke, the result is not going to be of any high quality UNLESS you're running the engine very slowly. And those cheap sensors won't hold up for long in these kind of conditions, unless you'r...
by Steam Captain
Mon Jun 14, 2021 2:24 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 134
Views: 148910

Re: digital steam engine indicator

Correct, a syphon won't work. The elasticity brought into the equation by adding a syphon would completely ruin any recognizability of a pV-graph. I've tried to get my hands on a pressure transducer, but the answer I got was always "We only sell to commercial buyers" - Those pressure sensors would h...